MIL-PRF-27197E
4.6.2.3 Static pressure test. The static pressure connection shall be open to the atmosphere, and
the pitot connection shall be connected to a mercury manometer, or equivalent. A pitot-static
pressure equivalent to a reading of 800 knots shall be applied to the indicator. The connecting
tubing shall be sealed. During a period of 1 minute, the level of Hg shall change no more than
0.15 inch.
4.6.3 Scale error.
4.6.3.1 IAS pointer scale error. For qualification or sampling tests, the indicator shall be tested
for scale error at all tests points in Table II. For individual tests, the indictor shall be tested for
scale error at only those test points marked with an asterisk in Table II. The indicator shall be
subjected to the pressure needed to produce IAS reading, first with increasing pressure, then with
decreasing pressure. The error at each point shall be within the tolerance in Table II.
TABLE II. Scale error tolerance
IAS (knots)
Differential pressure (inches Hg)
Tolerance (±knots)
80*
0.308
4.0
90
0.390
4.0
100*
0.481
3.0
110
0.583
3.0
120*
0.695
3.0
130
0.817
3.0
140*
0.949
3.0
150*
1.091
3.0
160*
1.244
3.0
170
1.406
5.0
180*
1.580
5.0
190
1.764
5.0
200*
1.959
5.0
220*
2.382
5.0
250*
3.104
5.0
280
3.924
5.0
300*
4.534
5.0
320
5.195
5.0
350*
6.286
5.0
380
7.502
5.0
400*
8.385
8.0
420
9.330
8.0
450
10.867
8.0
480
12.558
8.0
500*
13.776
8.0
520
15.069
8.0
550*
17.159
8.0
580
19.441
8.0
11
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